His traits are Neurotic, Inappropriate, Handy, Frugal and Family Oriented, which is quite strange because his aspiration is Romance in The Sims 2. The decision to not make him like a romantic Sim was probably done by developers to fit his character more into the typical "father" role. Other traits are completely unique.

His appearance didn't change much in The Sims 3. He still has short hair, but without a fringe, and his hair is red with brown roots, rather than the grey it would be in The Sims 2. His clothes are similar to the clothes he wears in The Sims 2, wearing a brown cardigan, blue shirt with white stripes, and brown pants. He has dark grey eyes, instead of brown as in The Sims 2. When the family is first played, Simis is 11 days from being an elder.

By the time the storyline has caught up to The Sims 2, he is already deceased, as is his wife. His son died of old age shortly after marrying Dina Caliente, leaving his daughter, Bella Goth, and his grandchildren, Cassandra and Alexander Goth, as his only living descendants. He died in the elder stage, hinting that he could have died of old age; however, his grave is nowhere to be found. For that reason, his cause of death is unknown, as he has no ghost, and he can't be resurrected under normal circumstances.

Since Cassandra Goth has no memories of Simis and Jocasta's deaths, it is possible that they died around the time she was born. That would (retroactively) explain why they did not appear in The Sims. When viewing his SimDNA in SimPE, his genes are for brown hair.